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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a002b99e27b602c74baab8df0d091f1d891a1544a05694d435b3be675346c923' 
  AND token = 'I0EOLJiJpQvXcQcyTMpS2W+aLsQY56mKxGJO7a/cnrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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