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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c642f241bb9913bd146671034d34c9190d98689928402cedcc743a272c3036f5' 
  AND token = 'd6a7SktKnPuuZx/sSfp+GL6ym0NxYDALwMQV3lWnBNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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