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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e27d6621ae7485ce80438db5b488c88bd3fc3ada75213d3b5c4e9570f6e2446' 
  AND token = '9G5vbq6PHfXemjqdt87Z1Zta8u9kJzxSgugpl1qGd2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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