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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97535af4fd1c676e6afa6e913982dfd29a97fce8659baa70e0b3b217445f7ace' 
  AND token = 'xJt2VjVhTebN/EuiT3f0J4oADik0ilvX+5xphqqs9mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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