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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cd66a9550bfea97ed1f68f94e53cb7efa6ad0be26534b491ada8285e10e30e' 
  AND token = 'wqbHYPBfIcxucu60wB1kzV/UjKQ7sLZFb20fYcHpm20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00173

JSON explain

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