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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00eca39870d3134dd65d75e3d4bb12ac3d3cc1508521cf62b67eca7d7cca4891' 
  AND token = '0U1ZfmM4Ig2y2LpckMZYkqmX95AztDqSbhv8uvdLWBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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