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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14a0e1397a160a5a02be4fd6137086df2c84e3b828c897ac93977f42dadd2f9' 
  AND token = 'TMTNyb5LkEGnbDoILbCDR7xj0Zp3N+XC0p1+KHkO3O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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