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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1698c708f78b5e8c40c3a0f1d6db7beb051dc4eab9d78b1eeac76dd216796d6' 
  AND token = '9NP4U/jjXZJNtAd8s5XpD7tKb2zGusxB1FCKftAznuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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