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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd27dd661dba2a79f04b12c1bc01df96fa5709e15f94e29d8aebe8b5093290ab' 
  AND token = 'p1GTunNY17IR8lG6vmiJTCZ+mXErkAuHvG5KYi71LMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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