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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce7e64c13ea27f8a5dfe637b4275d0f57efc3ec521bbf3de38cb482f078912a' 
  AND token = 'cP6Ik/IGdeY1NM576cRGB5fhG1p0m2rU6qACWIUnsms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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