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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10862596ab059c307a2d2f539f0a858f50d422a69eb985f1421b5973b9665a2' 
  AND token = 'g8bkQOZ0hNpJXrGny6ONAZP2IL87FBypHwts3uo2k+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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