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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24e98d023a7c692cb05177711d4b2a4a0c80d564f3c9d81df614ecde6f6ad34' 
  AND token = 'EWJ4Qt96OH9YPJuGqvn7Z6d8RmELpMSxHVExqPzwZ4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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