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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb37d13f8393b65f5a4a4da002c93751bc8a31a62ae349bc8524a13153f85056' 
  AND token = 'LW2NCb5SlW7/M4d6+DanlRMamF1zPRYVDYtwOC6BmK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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