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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb11dfc7d64146f721ab88c7226187dc4d82636f0133ffd1ba2cb52111bcd316' 
  AND token = 't3CoWc6Vfn8O/DOrOzc50zf6ce/y2wnpi8LP6NBAboU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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