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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195532d656430155c0ade45e5b8947724ba0857fa692ca3c6b96ee8beb86bdaa' 
  AND token = 'yo/upv9nh5rVauyJsDPY8/kRRFAb8uJ3viyBxOk+In0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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