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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab2c4de96be55bb2206dbf0dcac7b82c5fa73262f2cfab5fae725cbf24514a1' 
  AND token = '1RhijBo9nAtEvQCIFqmk/y3EENRbr1JtOd5LxunJAxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}