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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6967973070273e3e9b02eeb210355e27fff9ddd162bb628c508628d595e4b4d' 
  AND token = 'f5xF3a1JT/ZPI4qBpBwooBUJI/I/uqfib705DW7BJhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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