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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3c9f479c46b07c6aaf7f37e038d96f2267939d76a2d04d3f00cc094fde4f06' 
  AND token = 'ihKr/MA+sgFEeN393tjYU/VRK1KtL28c2NyU0X3nBIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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