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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac64ed1143314c5583031f5b5cdf8fab11242ed100055da30c7d784c4d3dffe7' 
  AND token = 'J5iSXv8JxGLisLNF1xJFR4/CUz1pDD001uqtBa59LRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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