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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b305b3661b9c14e2e764e9f01136faf3d97ecfcd524a9bf14a3e6ac8f9936746' 
  AND token = 'j4Ue8Q769O/fwk+/NlbcRkyKtlp1n2Bi6x4vOPUjCPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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