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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6346a389147309cff2cd81acc4a92c306840038d2fecf0e22aa71b2959daeb82' 
  AND token = 'F99vRMFvvMrnug4wQy1P3qcwdYH0zou6tPN5yyBOlaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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