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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be309e1a86d31c7da4de4bfe67011d8c182a1aac8b40c7c2f40524d0b431f94' 
  AND token = 'VajI27pQ1uzZUTsTwe4ti0udu39NnldBF4axEKCwAPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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