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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08962f65f319d615d6b052c19091c06304aea9de1d9ac990298656bc8eff152e' 
  AND token = 'JrH9d7XTO3Y2gCDhoi22qRdtTOujDV8phy/vfREoS68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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