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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89958c940213f7103e08e61ad14d3bf4e0073b8dca611d1e54b08f8ebb5faa8e' 
  AND token = 'cE3gXrLI7ryIRvHD4Ciwl6494/35yThC2wvqcbfrGdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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