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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ee43acdc66edee129d6e8fb1de601d39808420f7e86d44cb87986952106735' 
  AND token = '0G1Jm1GL8VZkSbbl6KZ6dtY3H4K5QpPj/P3dKuYZ9hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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