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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c739b70723682aa2dd302273214d7d0ef1f73d28f11812b0f5686029c98c9e36' 
  AND token = '9KDR9CAqKVGMkfsAV3dLgxWP9zmvugNl0MXh744KLDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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