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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e4759de8143bdbaf9c77114c577e8ca2d2ffa1338047bd6a1b054b3cc3c678' 
  AND token = 'FCscaIcvf71k7LpyQPVMoFUTw09c/E4vwy2KtBq90vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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