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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1b0bcb214aa00016638602f243aee1885cdf8502e7e20b36c7501bdc9cc74b' 
  AND token = 'KSWY4d0eoQnsr2yalIVSpOxVO9EY0y+vnTF+8h1Prs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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