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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3740f944492ffc232d61e9c32dba68ebcb46c395eb9c785dc5e8b1c571f9d5' 
  AND token = 'HccFQRTksM9iVW/5fse8M/C6nzVa16sh967eIPovQkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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