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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98db725f6cafb5cd26c3131eb3bf6309a138983a27b18b506ce24d4836e788e' 
  AND token = 'Qshm/+fhsm9Hetk0HAU2zeorQXItpu6P2tFOXC662eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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