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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d505a0c36f3748f4b62c1b02e236bcba04727ccf71fec03c92e089a2fd9789' 
  AND token = 'Xii6R6PXDMzlmU5N5Bpa+Pcf6tKpm+JIPgPuk6OAlz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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