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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34365fafcd0176226a54a70b312fec79eab2e23d1cf0787fd2f4e6f9738c30fd' 
  AND token = '13VNr6u0aVkoYnETO2eAPIWUAU8ePkoNbSH8VcpaWmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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