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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5007b778fa4b39db4ed73b6dc1a82e7505b7f0312b520ced72857abd553891e6' 
  AND token = 't2Ufry/9+jgJtsq4CaTy68oM6aMERf3i96SYPOgcz9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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