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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d50a9e6a69bdfc562f19893d32da73f8f67f55e2993d2307f1f743d5a2571cc' 
  AND token = 'OCrDcj4s2NUjfJvJsJUf+/vZe9NtB+oH34kEMQDzPMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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