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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147f925183a952cd585c87ec5fd57b19a4f4705da2e0f92877e63f9d8ac19ed6' 
  AND token = 'sSpDI+jy4m+RilHHENM+CCYFLdfqXrNH0RLdCm4qfWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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