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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3fc602b832e24598f8d32a73662c5acd7988b2f97d5134aadee360ce4c2d80' 
  AND token = 'NetVe46bdMzHjCleLdzQeZ1HkSXh3hopi1VWQ3w2dBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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