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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f411fdd078b9d84279f0c09544faedb07f3e21a78e7082c5d6bb3be2fd62a0b' 
  AND token = 'GlJqx3U0/AV7eagAfbWT5z86mqO9Ocw3dqdwKdSCX6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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