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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac27ce0834439fd5335c33bed180ebc0eef55afbbf7172d9bc51b726708c526' 
  AND token = 'aG08QBZLriGpeY5M8s4IWmZpDAuFeLQ7W4YMHXWa1ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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