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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800a22c5e146d1867cb22c89858ee3e275a3ce93008e11e2c8c7d7896da0d7d6' 
  AND token = 'w1D9g/Rv97AZec1SacRt+wXVFDNEBvsmKRLSzwpvmfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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