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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51856fd53dae598b49671fbdbe627b155bbb0098e361771bd703b6c3f3d30f8' 
  AND token = 'Ywf8KWc3h3PWc9skawO/fiFe15lzon+zFqPOqqN+Tl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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