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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7892b0732e0ed0feeb9421d46f39573c9249c5b4d30ede88d4293f3d23388e6' 
  AND token = 'oY5M6FJx+moVfMCW5RymHM8OxJzk+AQBopnhwOpbbxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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