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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2961eb3fc5853de60fe39bbb6a3fc2476d647ad8ece6a795e7d0af3151113a6e' 
  AND token = 'ruRdD3Y6YnPsTl9/woO8vdF10W7XsTVHIe4bWvlUxI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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