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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd016d9b58a40e0dda60ca86e78772286297472f7634f3fba9deb8217c91f1b2' 
  AND token = 'fdABQRv+FvkjUrDa4kXR23qxDdChG1cx6WydkvvZOmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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