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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d0f49e2c76ca3d4270ac57b6914ada24c091e8ce2e50c062eaf2a493590304' 
  AND token = '8TafQzlb2dpZhHyz+gKT4hwvoSi5ljf9+4Hyal4h3Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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