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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0badc6e255147ca94e20783fb916b70a880e1382733698a10d7db3fd0b0a226' 
  AND token = 'LVEOl1cLwqM5kyrARnUvTg4pUT0w080M8Hh+OTDrDsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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