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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae84f81976745b12304121641f799d82948c948095f7d956c9c22a07e4ed4665' 
  AND token = 'Vsx/RV9UskVzsEGtu6AotOqYHkzGpMq8Q5yRreli9zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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