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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990e4de3abcebfa869c96268c8ad36207358b48e53df7657d23d69ef8c219abe' 
  AND token = '8ZxlrZHid29vrkNRuCv3velncs0YyC3tW+q5jGO7y/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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