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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9280f473594fc408e6b2d1d7d4f9a23d2b65673ac51bcc27826dde3e4ba8adc1' 
  AND token = 'dKqZqBB2N88KgdV95LWodtt8Ib1f8TRYRPZ7Oi5kMys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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