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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e78a988a67cb69c289910b9b7a20faca6ea8f4959da83b4f39af8a17d4f096c' 
  AND token = '8Tz6lWtvxOip8tw1YzAifDoT5zeHIez1/+XKXvbt2qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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