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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b785a059dc92bea5ad3b69cc4b0147de5a30ac415e3634c7f6ed31687e84cf81' 
  AND token = 'qtWmq5psZDs0hMYr1kt7jkR8+S8URTwV8mRHrWz5Swc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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