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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4af7ee5cea0d59b3939d24ea03bbdbba9cd296813dea741f0808918e75e9fd' 
  AND token = 'QeD3MpVIj6jwHQre1U0OTImdHfWjF27UhPWeCttAo7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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