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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec78e8da76e5bbf46ce00431be264f9097067f762eea07f06b1852d4c76a775' 
  AND token = 'pOR46v7/LXdXfilkAeClyssUVLDzrIgSm48tU6ic1q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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