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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d3397ae81e7c4225066d7907d98d1fc9e3841bcf1c474e54e1998a9272e06b' 
  AND token = 'amHpvd5510LCflh6+NJ5VwbPEINlk+K8arnVdaaujP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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