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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665d234bb8ee91ac146d900fecbed3c42d89e40cf23ce5014d685c9673a12840' 
  AND token = '3VQtcz7HG2jMeVA+6WtxaoBEiuxWJBFLu86wJhnB1MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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