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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc9f4f0d048d3f169fca23eb533885ff4c906952e66ac9a0ab1ade3cb420b5e' 
  AND token = 'ccvO55JBprBnn+/R2zm6N/Aw4MhWBDNL1VPEcv2Pmrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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