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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae919faa4aef4cf6fe4358ec7bfc5e4c80dc10c2b6beb0679882157ac68a390' 
  AND token = 'n0vWgo2kQ0AJjJWeqOxCv2WV+hAKGsLe3mueWAoNXSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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