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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969fa7a1a5b50ec56b519aca9f3f214e06b040c7b8d1b0f0d2fe4724977a0aac' 
  AND token = 'mwPFgj6nluWzpFx6xctgIonA1QNKslPat01wdsZ/aUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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