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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0decec52070b208edc74bb872f305966ad5f776c6eb391c23df0f212497c9b6' 
  AND token = '5AnNcafIgeWrWPApd6C9q6qgDYXcVKjUk2xd6d5YqTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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