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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92b58df0d226b42e005a6c4935190b1858a861de6d3d87e599dd3b8bf7e07b4' 
  AND token = 'u2WoMc13XMYXlF7j+kvmtSniXr7cJTpVroB96ZIeecQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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