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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ea71b17e12873c3d45189fa4c55433ef88789c41e376d6ecee82f196fb0460' 
  AND token = 'gfhQDgY9ssR+7Ruifa2JuAfpPnrLgjbch5QFvZimE74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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