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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007084b98c76b97d20b88ec6b1dc1fe18df1fe336397ef8ccf3bf8f18bed660e' 
  AND token = '6Nbcq6Y2As85CXX6HlceVI144w67Y6AdVHX9N7QtmvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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