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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bf504b0897b3ac91dc7d2ceb49e0b38a3b1df1aa2c7df4fce22eb5015fb1cb' 
  AND token = 'E9i+ArXh/gVC/6VUVRX8qt3Zm9DqYN6UX6pcjDVLOjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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