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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23c31af311cd34fa6cbf0a3c19366f32d269a2d47b287793bd6051dcd71b9cb' 
  AND token = 'KAbgh0U1M2zQto9IMVXAB4VN6FzZHIxotb72quU15so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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